Electric extension cord plug



-9,1 0. w.1 .RoEsELER 2,186,656

ELECTRIC EXTENSION COBD'PLUG Filed Aug. 24, 1938 In venior AttorneysPatentcd Jan. 9, 1940 UNITED STATES- z,1se, ess I PATENT OFFICE 1 Claim.

This invention relates to an electric extension cord plug, and has forthe primary object the provision of a device of this character which isespecially adapted for use with an electric output 5 of thetypeemploying a screw threaded socket and eliminates customary practice ofscrewing the plug element into and out'of the socket and which may beeasily inserted into the socket for eflicient electrical connectionwithout having to turn or rotate the plug inorder to properly positionthe same for entrance in the socket as is customary with the commontypeof prong plug v and socket therefor.

With these and other objects in view,-the invention consists in certainnovel features of construction, combination and arrangement of parts tobe hereinafter more fully described and claim- For a completeunderstanding of my invention, v

20 reference isto be had to the accompanying drawing and followingdescription.

In the drawing, Y

Figure 1 is a vertical sectional vi w illustrating the plug and anadapter therefor and con- :tructed in accordance with the presentinvenion.

Figure 2 is an end view illustrating the plug.

Figure -3 is a view showing a modified form of adapter.

Figure 4 is an end view of the adapter shown in Figure. 3.

Referring in detail to the drawing, the numeral 5 indicates the plug and6 the adapter. The plug 5 includesv a cap portion 1 provided with a 35,chamber 1 and an opening 8 to admit to said chamber 1 an electricextension cord indicated in dotted lines in Figure 2. The plug 5 furtherincludes a. plug portion 9 integrally connected with the cap portion byspaced arms ill and a 4o marginal flange H depending below said arms forengagement with the adapter 6 when the plug portion is inserted therein.The spaced arms Ill form one wall of the chamber 1'.

A conductor strip I2 is arranged centrally of the plug portion 9 andextends through the free end of the latter in the form of a headedcontact l3. The contact strip l2 includes an angularly related portionl4 which extends through the side of the plug portion adjacent the'capportion and underlies one of the arms I andis secured to the latter by aset screw l5 also employed for connecting one of the wires'ofthe'extension cord to the contact strip I2. I An annular contactmember I5 is setin a recess formed in the plug portion 9 intermediate(Cl. 17H) I the ends of the latter and has connected thereto a contactstrip I6, a portion of which is embedded in the plug portion '9 andanother portion thereof extends outwardly-from the plug portion 9 andunderlies another of said arms l and is secured U thereto by a set screwH which acts to connect the other wire of the extension cord to thedevice.

The adapter 6 includes a cylindrical shell l8 of insulating materialhaving integral with one end an annular portion l9 defining an opening20 to receive the plug portion 9 of the plug and also provides a fingerpiece for the rotation of the adapter into and out of an electric outputof the screw threaded socket type.

A-screw threaded ferrule type contact 2| is mounted on thecylindricalportion l8 of the adapter for threading the latter into theouput socket. Resilient fingers 22 are formed on the contact 2| andextend upwardly into the cylindrical portion 18 of the adapter andengage with the annular contact l5 of the plug portion 9. Thus it willbe seen that the plug 5 can be easily inserted and withdrawn from theadapter without the necessity of adjusting the plug to any particularposition or relation to the adapter except to arrange the plug for anendwise movement into and out of the adapter.

Referring to my modified form of the invention as shown in Figures 3 and4,the adapter is indicated by the character 23 and may provide anelectric socket for the plug 5 by having the electrical lead wiresconnected to the set screws 24 and 25. The adapter 23 includes a baseportion 28 and a socket portion 21. The set screw 25 is locatedcentrally of the inner end of the socket portion 21 to be engaged by thecontact head l3 of the plug 5.

Spring contactfingers 28 are arranged in the socket portion 21 to engagewith the annular contact 15' of, the plug and one of said fingers iscon- 4i) nected to the set screw 24 while the other finger is clampedbetween the socket portion 21 and a the base portion 26.

It is believed that the foregoing description,

when taken in connection with the drawing will fully set forth theconstruction and advantages of this invention to those skilled in theart to which such devices relate so that further detailed descriptionwill not be required.

What is claimed is: An electric fixture comprising a' plug including acap portion having a chamber and an opening to permit an electricextension cord to enter said chamber and a plurality of spaced armportions forming one wall of the chamber and a plug norbe tion integralwith said arm portions, said plug portion, set screws threaded throughthe contact portion having a. bore extending through one end strips intocertain of the arm portions of the cap thereof, a. contact stripextending through the portion for connecting wires of the extension cordbore outwardlyof one end of the plug portion and to said contact strips,and an annular contact 5 through one side of said plug portion inengagemember mounted on the plug portion and elec- 6 ment-with the capportion, a second contact strip trically connected to the second-namedcontact inserted in the plug portion and extending outstrip. wardlytherefrom into engagement with the cap WILLIAM LYLE ROESELER.

